This IEEE Spectrum article describes how BYD has launched a version of its compact SUV BYD Song Pro in Brazil equipped with a flex-fuel plug-in hybrid drivetrain capable of running on electricity, gasoline, or any mix of gasoline and ethanol.
This isn’t just another hybrid. The Song Pro’s engine is reportedly the world’s first plug-in hybrid powertrain specifically designed to work with biofuel, a nod to Brazil’s long history with ethanol fuel dating back decades. BYD says the technology aims to make flexible-fuel hybrids affordable enough for everyday drivers, unlike previous flex-fuel hybrids that were often expensive and limited in reach.
Engineering wise, this required more than plugging in an ethanol sensor. Ethanol has different combustion characteristics than gasoline, requiring modifications to fuel injection, fuel-air mixture control, and engine management. In a hybrid architecture, coordinating between the internal combustion engine and electric drive, while ensuring fuel-agnostic operation, adds complexity. According to experts cited in the article, BYD appears to have engineered a cost-effective solution that maintains performance and efficiency across all modes.
On pricing: the Brazilian-market Song Pro was offered at a promotional price around US $25,048, with a regular list price around US $35,000, comparable to other plug-in hybrids globally, which suggests a competitive offering rather than a premium niche product.
This move reflects more than a business decision. For a country where ethanol fuel, often derived from sugarcane, is deeply embedded in infrastructure and consumer habits, the flex-fuel hybrid is almost a natural evolution. As one historian quoted in the article notes, this innovation builds on Brazil’s decades-long ethanol experiment rather than introducing a totally foreign concept.
BYD’s Song Pro positions itself as a practical, locally tuned alternative on Brazil’s road to cleaner mobility, balancing electric-vehicle ambition with the realities of existing fuel systems.